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Full text of "Monthly performance report : Helio Thermics, Inc. - lot 6"

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SOLAR/1025-79/04 

Monthly 

Performance 

Report 



HELIO THERMICS, INC. - LOT 6 

APRIL 1979 







FEB 



14 



6 V ^*»— 




U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

HELIO-THERMICS, INC. 
HOUSE LOT 6 

APRIL 1979 



I. SYSTEM DESCRIPTION 

Helio-Thermics Inc., House Lot 6 is one of two instrumented single-family 
residences in Greenville, South Carolina. The home has approximately 1086 
square feet of conditioned space. Solar energy is used for space heating the 
home and preheating domestic hot water (DHW). The solar energy system utilizes 
the attic space as the solar energy collector. The attic roof faces 10 degrees 
west of south and is pitched at an angle of 51 degrees from the horizontal. 
Solar energy enters the attic through a 416-square-foot aperture which is 

double-glazed with corrugated, translucent, fiberglass-reinforced, acrylic 
panels. The interior of the attic is painted black to maximize the absorption 

of solar energy. Warm air accumulates in the peak of the attic roof and 
circulates through the conditioned space or through storage by an air handler. 

Solar energy is stored in an 870-cubic-foot storage bin containing 85,460 
pounds of crushed rock. The bin is located under the house and is insulated 
with 2-inch polystyrene insulation. Cold water is preheated in the attic by 
thermos i phoning water from the 80-gallon preheat tank through a manifold 
system of copper tubes. These tubes are attached to black sheet-metal plates, 
thus enhancing absorption of solar radiation for preheating the water as it 
circulates to and from the preheat tank. Preheated city water is stored in 
the preheat tank and supplied, on demand, to a conventional 80-gallon DHW 
tank. When solar energy is insufficient to satisfy the space heating load, a 
water-to-air heat exchanger in the hot air supply-duct provides auxiliary 
energy for space heating. A gas-fired water heater provides auxiliary energy 
for the water-to-air heat exchanger and the DHW. The system, shown schemat- 
ically in Figure 1, has seven modes of operation. 

Mode 1 - Collector-to-Storage : This mode activates when there is no demand 
for space heating and the collector supply-duct temperature is 26°F higher 
than the storage temperature. This mode terminates when the temperature 
difference between the collector and storage is less than 16°F. 




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Mode 2 - Storage-to-Space Heating : This mode activates when space heating is 
required (but is not available from the collector) and the storage tempera- 
ture exceeds the building ambient temperature by 5°F. This mode terminates 
when the building ambient temperature equals the storage temperature or when 
space heating is no longer required. 

Mode 3 - Collector-to-Space Heating : This mode activates when space heating 
is required and the collector supply-duct air temperature is 10°F higher than 
the building ambient air temperature. This mode terminates when the tempera- 
ture difference drops to less than 6°F or the space heating requirement is 
satisfied. 

Mode 4 - Auxiliary Energy-to-Space Heating : This mode activates when space 
heating is required and thermal energy is not available from the collectors 

or storage. An electrical heating element in the hot air supply-duct remains 
on until the space heating demand is satisfied. 

Mode 5 - Summer Mode, Passive Cooling Storage : This mode can be activated 
when the residents wish to store cool air in storage for circulation the next 
day. The air-handler fan activates and an outside air-intake damper opens to 
allow the cool air to circulate through the attic and storage. 

Mode 6 - Summer Mode, Space Cooling : This mode can be activated when cool 
air from storage is desired in the living area. The outside air-intake 
damper closes, the duct to the living area opens, and the air-handler fan 
activates. 

Mode 7 - DHW Preheating : This mode activates when there is a demand for hot 
water. Water is drawn from the conventional DHW tank and replenished with 

heated water from the preheat tank. The DHW subsystem has this one independent 
mode of operation for preheating. 



II. PERFORMANCE EVALUATION 



INTRODUCTION 



The site was occupied in April and the solar energy system operated contin- 
uously during the month. Solar energy satisfied 12 percent of the space 
heating requirements and provided a fossil fuel energy savings of 0.081 mil- 
lion Btu. 

To prevent the possibility of water freezing in the thermosiphoning subsystem, 
this solar energy system component (located in the attic) has been drained 
until all danger of freezing is past. 

For 16 days during April, the solar Bnergy system was in a partial summer 
mode; that is, no attempt was made to collect and transport solar energy to 
the storage subsystem. This method of operation reduces the solar energy 
migrating into the house during warm days, but also creates an undesirable 
effect when space heating is required during the night. Occasionally, when 
solar energy is not being transported to storage, the storage temperature will 
drop below the temperature in the living area and become ineffective as a 
source of thermal energy. However, the thermal energy provided by conven- 
tional methods to satisfy the heating load also circulates through the storage 
bin and, in effect, heats the storage bin. This undesirable method of opera- 
tion occurs during transitional months and has a small impact on the long-term 
effectiveness of the solar energy system. 



WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
18.1 million Btu for a daily average of 1453 Btu per square foot. This was 
below the estimated average daily solar radiation for this geographical area 
during April of 1546 Btu per square foot for a south-facing plane with a tilt 



of 51 degrees to the horizontal. The average ambient temperature during April 
was 59°F as compared with the long-term average for April of 61 °F. 



THERMAL PERFORMANCE 

Collector - The total incident solar radiation on the collector array for the 
month of April was 18.1 million Btu. During the period the collector loop was 
operating, the total insolation amounted to 5.0 million Btu. The total col- 
lected solar energy for the month of April was 1.2 million Btu, resulting in a 
collector array efficiency of 7 percent, based on total incident insolation. 
Solar energy delivered from the collector array to storage was 0.90 million 
Btu. Energy loss during transfer from the collector array to storage was 
0.30 million Btu. This loss represented 25 percent of the energy collected. 
Operating energy required by the collector loop was 0.11 million Btu. 

Storage - Solar energy delivered to storage was 0.90 million Btu. During the 
latter part of April the system was occasionally operating in a storage-to- 
load mode. Because the storage temperature was below the living area tempera- 
ture, relatively cool air was transported from storage, through the conven- 
tional space heating subsystem, through the living area and then back to 
storage. This situation results in the storage temperature being increased by 
the conventional space heating subsystem. The numerical effect of this operat- 
ing method is indicated as a negative 0.26 million Btu being transported from 
storage. The average storage temperature for the month was 76°F. 

DHW Load - There was no solar energy contribution to the DHW load of 1.4 
million Btu because the thermosiphoning subsystem had been drained. A daily 
average of 63 gallons of DHW was consumed at an average temperature of 153°F 
delivered from the tank. 

Space Heating Load - The space heating subsystem consumed 0.049 million Btu of 
solar energy and 0.35 million Btu of auxiliary thermal energy to satisfy a 



space heating load of 0.40 million Btu. The solar fraction of this load was 
12 percent. The space heating subsystem consumed a total of 0.091 million Btu 
of operating energy in order to distribute both solar and auxiliary thermal 
energy. 



OBSERVATIONS 

The gas flow totalizer used to quantify the gas consumption is not providing 
valid data. The measurement of auxiliary thermal energy consumption in the 
DHW subsystem will not be available until this problem is corrected. 



ENERGY SAVINGS 

The solar energy system provided a total fossil fuel energy savings of 0.081 
million Btu at an electrical energy expense of 0.14 million Btu. 



III. ACTION STATUS 

Boeing will schedule a site visit in the near future to correct the erroneous 
gas totalizer data readings. 







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